我使用CanvasWatchFaceService创建了一个表盘。我创造了表盘。并为手机创建了配置应用程序。
问题是，我的表盘正在消耗过多的电池，当手表进入睡眠时它会在1-2分钟内醒来。手表太多了，我希望它顺利运行。它也在重新启动我的手表。
我正在测试Moto 360上的Watch Face。
public class DigitalWatchFaceService extends CanvasWatchFaceService {
String[] days = { "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT" };
String[] months = { "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG",
"SEP", "OCT", "NOV", "DEC" };
Prefs prefs;
@Override
public Engine onCreateEngine() {
/* provide your watch face implementation */
return new Engine();
}
/* implement service callback methods */
private class Engine extends CanvasWatchFaceService.Engine {
boolean hr24Format = false;
int hourColor = -1, minuteColor = -16742014, secondColor = -16723470,
backgroundColor = -16761271;
int width, centerX, centerY;
Canvas canvas;
Typeface typeFace;
Paint hourPaint;
Paint minutePaint;
Paint datePaint;
Paint hourCircle, minuteCircle, secondCircle;
RectF ovalHour, ovalMinute, ovalSecond;
Calendar cal;
int day, month, date;
Rect hourBounds, minuteBounds, dateBounds;
String mHour = "00", mMinutes, mDate;
int hh, mm, ss;
boolean inAmbientMode;
@Override
public void onCreate(SurfaceHolder holder) {
super.onCreate(holder);
/* initialize your watch face */
setWatchFaceStyle(new WatchFaceStyle.Builder(
DigitalWatchFaceService.this)
.setCardPeekMode(WatchFaceStyle.PEEK_MODE_VARIABLE)
.setBackgroundVisibility(
WatchFaceStyle.BACKGROUND_VISIBILITY_INTERRUPTIVE)
.setShowSystemUiTime(false).build());
prefs = new Prefs(DigitalWatchFaceService.this);
typeFace = Typeface.createFromAsset(getAssets(), "roboto.ttf");
initAssets();
setAssets();
}
private void setAssets() {
// TODO Auto-generated method stub
hourPaint.setColor(hourColor);
hourPaint.setTextSize(70);
hourPaint.setTypeface(typeFace);
hourPaint.setAntiAlias(true);
minutePaint.setColor(minuteColor);
minutePaint.setTextSize(70);
minutePaint.setTypeface(typeFace);
minutePaint.setAntiAlias(true);
datePaint.setColor(hourColor);
datePaint.setTextSize(20);
datePaint.setTypeface(typeFace);
datePaint.setAntiAlias(true);
hourCircle.setColor(hourColor);
hourCircle.setStyle(Paint.Style.FILL);
hourCircle.setStyle(Paint.Style.STROKE);
hourCircle.setStrokeWidth(7);
hourCircle.setAntiAlias(true);
minuteCircle.setColor(minuteColor);
minuteCircle.setStyle(Paint.Style.FILL);
minuteCircle.setStyle(Paint.Style.STROKE);
minuteCircle.setStrokeWidth(5);
minuteCircle.setAntiAlias(true);
secondCircle.setColor(secondColor);
secondCircle.setStyle(Paint.Style.FILL);
secondCircle.setStyle(Paint.Style.STROKE);
secondCircle.setStrokeWidth(2);
secondCircle.setAntiAlias(true);
ovalHour.set(32, 32, width - 32, width - 32);
ovalMinute = new RectF();
ovalMinute.set(22, 22, width - 22, width - 22);
ovalSecond = new RectF();
ovalSecond.set(15, 15, width - 15, width - 15);
}
private void initAssets() {
// TODO Auto-generated method stub
hourPaint = new Paint();
minutePaint = new Paint();
datePaint = new Paint();
hourCircle = new Paint();
minuteCircle = new Paint();
secondCircle = new Paint();
ovalHour = new RectF();
hourBounds = new Rect();
minuteBounds = new Rect();
dateBounds = new Rect();
}
@Override
public void onPropertiesChanged(Bundle properties) {
super.onPropertiesChanged(properties);
/* get device features (burn-in, low-bit ambient) */
}
@Override
public void onTimeTick() {
super.onTimeTick();
/* the time changed */
}
@Override
public void onAmbientModeChanged(boolean inAmbientMode) {
super.onAmbientModeChanged(inAmbientMode);
/* the wearable switched between modes */
this.inAmbientMode = inAmbientMode;
if (inAmbientMode) {
backgroundColor = -16777216;
hourColor = -1;
minuteColor = -1;
} else {
hourColor = prefs.getPrefs(Prefs.hourColor, -1);
minuteColor = prefs.getPrefs(Prefs.minuteColor, -16742014);
backgroundColor = prefs.getPrefs(Prefs.backgroundColor,
-16761271);
}
setAssets();
}
private final String HOUR_FORMAT = "hh";
private final String HOUR_FORMAT_24 = "kk";
private final String MINUTE_FORMAT = "mm";
@Override
public void onDraw(Canvas canvas, Rect bounds) {
/* draw your watch face */
this.canvas = canvas;
width = bounds.width();
centerX = bounds.centerX();
centerY = bounds.centerY();
backgroundColor = prefs.getPrefs(Prefs.backgroundColor, -16761271);
canvas.drawColor(backgroundColor);
drawForNormalMode();
}
public void drawForNormalMode() {
hr24Format = prefs.getPrefs(Prefs.format24Key, false);
if (!inAmbientMode) {
hourColor = prefs.getPrefs(Prefs.hourColor, -1);
minuteColor = prefs.getPrefs(Prefs.minuteColor, -16742014);
secondColor = prefs.getPrefs(Prefs.secondColor, -16723470);
backgroundColor = prefs.getPrefs(Prefs.backgroundColor,
-16761271);
}
setTimeNormal();
}
public void setTimeNormal() {
cal = Calendar.getInstance();
day = cal.get(Calendar.DAY_OF_WEEK);
month = cal.get(Calendar.MONTH);
date = cal.get(Calendar.DATE);
// draw hour
if (hr24Format == false)
mHour = new SimpleDateFormat(HOUR_FORMAT).format(cal.getTime());
else
mHour = new SimpleDateFormat(HOUR_FORMAT_24).format(cal
.getTime());
hourPaint.getTextBounds(mHour, 0, mHour.length(), hourBounds);
canvas.drawText(mHour, centerX - hourBounds.width() - 15, centerY
- hourBounds.centerY(), hourPaint);
// draw minute
mMinutes = new SimpleDateFormat(MINUTE_FORMAT)
.format(cal.getTime());
minutePaint.getTextBounds(mMinutes, 0, mMinutes.length(),
minuteBounds);
canvas.drawText(mMinutes, centerX,
centerY - minuteBounds.centerY(), minutePaint);
// draw date
if (!inAmbientMode) {
mDate = days[day - 1] + ", " + months[month] + " " + date;
datePaint.getTextBounds(mDate, 0, mDate.length(), dateBounds);
canvas.drawText(mDate, centerX - dateBounds.centerX(), centerY
+ hourBounds.height() + 10, datePaint);
}
// draw minute circle
mm = cal.get(Calendar.MINUTE);
circularMinute(mm, 60);
// draw hour circle
hh = cal.get(Calendar.HOUR);
circularHour((hh * 60) + mm, 720);
// draw second circle
if (!inAmbientMode)
ss = cal.get(Calendar.SECOND);
circularSecond(ss, 60);
invalidate();
}
private void circularHour(int number, int max) {
canvas.drawArc(ovalHour, 270, ((number * 360) / max), false,
hourCircle);
}
private void circularMinute(int number, int max) {
canvas.drawArc(ovalMinute, 270, ((number * 360) / max), false,
minuteCircle);
}
private void circularSecond(int number, int max) {
canvas.drawArc(ovalSecond, 270, ((number * 360) / max), false,
secondCircle);
}
@Override
public void onVisibilityChanged(boolean visible) {
super.onVisibilityChanged(visible);
/* the watch face became visible or invisible */
}
}
}
答案 0 :(得分：2)
您在“onDraw”（“setTimeNormal”的最后一行）中调用“invalidate”，因此您的表盘将不断重复绘制。
<强>更新
请按照此处的文档： http://developer.android.com/training/wearables/watch-faces/drawing.html
WatchFace每分钟自动绘制一次，因此除非您正在进行自定义动画或需要的速度超过每分钟1次，否则您不应该调用“invalidate”。